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Phase I Equivalent Stormwater Manuals for Western Washington
The Washington State municipal stormwater permits require permitted local governments to establish programs that prevent and control the impacts of runoff from new development, redevelopment and construction sites. Minimum requirements, thresholds and definitions are in Appendix 1 of the municipal stormwater permits. In addition, local governments in Western Washington must adopt a site planning process, and criteria for selection and design of best management practices similar to that described in Ecology’s Stormwater Management Manual for Western Washington.
Phase I Permittees must submit draft Manuals and other enforceable documents to Ecology for review and approval under the Phase I Permit. Ecology is reviewing these submittals compliance with applicable permit requirements.
Western Washington Phase II Permittees have the option of either adopting portions of Ecology’s Stormwater Manual or portions of a manual determined to be equivalent to Ecology’s Stormwater Manual through the Phase I submittal review.
This webpage provides information for Western Washington Phase II Permittees regarding Phase I manuals. Ecology will post additional information on this page following reviews of the Phase I Permittees’ submittals. This information on Western Washington Phase II requirements does not apply to Eastern Washington Phase II permit requirements.
King County Surface Water Design Manual – Pending final approval
Ecology completed review of King County’s 2005 Surface Water Design Manual in February 2008. The comment letter provides information about
Ecology’s comment letter of February 19, 2008 to King County regarding manual equivalency.
The material King County submitted is available online on King County’s webpage for 2008 Proposed Updates of King County Stormwater Regulations.
City of Tacoma – Under review: not yet approved for use
Ecology is currently reviewing the City of Tacoma’s Phase I submittal. The material the city submitted is available online on the City of Tacoma’s webpage for NPDES Municipal Stormwater Permit Submittals.
City of Seattle – Under review: not yet approved for use
Ecology is currently reviewing the City of Seattle’s Phase I submittal. The material the city submitted is available online on the City of Seattle’s webpage at City of Seattle Proposed Revisions to Stormwater Code.
Pierce County – Under review: not yet approved for use
Ecology is currently reviewing Pierce County’s Phase I submittal.
Snohomish County – Under review: not yet approved for use
Ecology is currently reviewing Snohomish County’s Phase I submittal. The material the County submitted is available online on the Snohomish County website at Snohomish County NPDES Draft Stormwater Regulations.
Clark County – Not yet submitted for review
Ecology contacts for Phase I and Phase II municipal stormwater permit questions